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Finding the Fourth Proportional to 108.66, 161.88 and 103.50

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Solution

The fourth proportional to 108.66, 161.88 and 103.50 is: 154.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    108.66 : 161.88 = 103.50 : x
  2. Step 2: Convert to fraction form
    108.66/161.88 = 103.50/x
  3. Step 3: Cross multiply
    108.66x = 161.88 × 103.50
  4. Step 4: Simplify right side
    108.66x = 16,754.58
  5. Step 5: Solve for x
    x = 16,754.58/108.66
  6. Step 6: Final answer
    x = 154.19

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.